Cisco Systems network hardware 3.6 Manual

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Cisco Systems network hardware 3.6
4-6
Cisco Active Network Abstraction Fault Management User Guide, Version 3.6 Service Pack 1
OL-14284-01
Chapter 4 Advanced Correlation Scenarios
IP Interface Failure Scenarios
Interface Example 1
In this example there is multipoint connectivity between a PE and number of CEs through an unmanaged
Frame Relay network. All the CEs (Router2 and Router3) have logical connectivity to the PE through a
multipoint subinterface on the PE (Router10). The keep alive option is enabled for all circuits. A link is
disconnected inside the unmanaged network that causes all the CEs to become unreachable.
Figure 4-3 Interface Example 1
The following failures are identified in the network:
• A device unreachable alarm is generated for each CE.
• An ip interface status down alarm is generated for the multipoint IP interface on the PE.
The following correlation information is provided:
• The root cause is IP subinterface down.
• All the device unreachable alarms are correlated to the ip interface status down alarm on the PE.
Interface Example 2
In this example there is point-to-point connectivity between a PE and a CE through an unmanaged Frame
Relay network. CE1 became unreachable, and the status of the IP interface on the other side (on the PE1)
changed state to down. The “keep alive” option is enabled. The interface is shut down between the
unmanaged network and CE1.
Figure 4-4 Interface Example 2
The following failures are identified in the network:
• A device unreachable alarm is generated on the CE.
interface Serial0/0.100
point-to-point
10.200.1.2
interface Serial0/0.101
point-to-point
10.200.1.3
interface Serial0/0.55
multipoint
10.200.1.10
unreachable
Router2
10.222.1.2
unreachable
Router2
10.222.1.3
Frame-Relay
cloud
Multipoint
connectivity
Router10
10.222.1.10
180434
multipiont
IP interface
State "down"
interface Serial1/0.500
point-to-point
102.0.0.2
interface Serial1/0.100
point-to-point
102.0.0.1
unreachable
CE1
60.60.60.4
Frame-Relay
cloud
Point-to-point
connectivity
PE1
80.80.80.69
180435
Point-to-point
IP interface
State unknown
Point-to-point
IP interface
State "down"
Routing Protocol
neighbor down syslog
(BGF, OSPF)
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